data_global _amcsd_formula_title 'Rb2O2' loop_ _publ_author_name 'Wyckoff R W G' _journal_name_full 'Crystal Structures' _journal_volume 1 _journal_year 1963 _journal_page_first 85 _journal_page_last 237 _publ_section_title ; Second edition. Interscience Publishers, New York, New York Rubidium peroxide ; _database_code_amcsd 0011668 _chemical_formula_sum 'Rb O' _cell_length_a 4.201 _cell_length_b 7.075 _cell_length_c 5.983 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 177.827 _exptl_crystal_density_diffrn 3.790 _symmetry_space_group_name_H-M 'I m m m' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2+x,1/2+y,1/2+z' 'x,-y,z' '1/2+x,1/2-y,1/2+z' '-x,y,-z' '1/2-x,1/2+y,1/2-z' '-x,y,z' '1/2-x,1/2+y,1/2+z' 'x,-y,-z' '1/2+x,1/2-y,1/2-z' 'x,y,-z' '1/2+x,1/2+y,1/2-z' '-x,-y,z' '1/2-x,1/2-y,1/2+z' '-x,-y,-z' '1/2-x,1/2-y,1/2-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z Rb 0.00000 0.25000 0.00000 O 0.00000 0.00000 0.37500